Toward a cochlear implant electrode array with shape memory effect for post-insertion perimodiolar positioning.
austenite finish temperature
modiolus hugging electrode
nickel titanium alloy
nitinol
shape memory alloy
smart material
transformation temperature range
Journal
Journal of biomedical materials research. Part B, Applied biomaterials
ISSN: 1552-4981
Titre abrégé: J Biomed Mater Res B Appl Biomater
Pays: United States
ID NLM: 101234238
Informations de publication
Date de publication:
11 2022
11 2022
Historique:
revised:
16
05
2022
received:
07
12
2021
accepted:
20
05
2022
pubmed:
10
6
2022
medline:
20
9
2022
entrez:
9
6
2022
Statut:
ppublish
Résumé
For cochlear implants (CI) a final position of the electrode array (EA) along the inner wall of the spirally shaped cochlea is considered to be beneficial because it results in a closer proximity to the auditory nerve fibers. A shape memory effect (SME) could facilitate such shift of the EA toward the cochlear inner wall, but its implementation remains to be solved. The current study presents an EA prototype featuring the SME with minute adjustments of the material properties of Nitinol, a shape memory alloy, in combination with a suitable cooling strategy to prevent premature curling. Ten samples were successfully inserted by a CI surgeon into an artificial cochlear model submerged into a temperature-controllable water bath to simulate temporary hypothermia of the inner ear (31°C). Gentle insertions were possible, with an average insertion speed of 0.81 ± 0.14 mm/s. After recovery of body temperature, the desired position shift toward the modiolus was observed in all trials. Angular insertion depth increased by approximately 81.8° ± 23.4°. We demonstrate for the first time that using the body temperature responsive SME for perimodiolar EA positioning is feasible and does not impede a gentle surgical insertion.
Substances chimiques
Shape Memory Alloys
0
Water
059QF0KO0R
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2494-2505Subventions
Organisme : Deutsche Forschungsgemeinschaft
ID : 2751/1-1
Organisme : Germany's Excellence Strategy
ID : EXC 2177/1
Informations de copyright
© 2022 The Authors. Journal of Biomedical Materials Research Part B: Applied Biomaterials published by Wiley Periodicals LLC.
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